Method for estimating self-interference signal based on iterative estimation and apparatus using the same

Abstract

Disclosed herein are a method for estimating a self-interference signal based on iterative estimation and an apparatus for the same. The method is configured to transmit two preamble signals from the transmission antenna of one terminal to the reception antenna thereof, to estimate third-order nonlinear distortion, which distorts a self-interference signal, based on a transmission signal and a reception signal for each of the two preamble signals, to update the reception signal by eliminating the third-order nonlinear distortion therefrom, to re-estimate the third-order nonlinear distortion based on the updated reception signal, and to estimate the self-interference signal based on the final third-order nonlinear distortion, which is acquired by repeatedly re-estimating the third-order nonlinear distortion as many times as a preset number of iterations.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This application claims the benefit of Korean Patent Application No. 10-2017-0169503, filed Dec. 11, 2017, which is hereby incorporated by reference in its entirety into this application.BACKGROUND OF THE INVENTION1. Technical Field[0002]The present invention relates generally to a method for estimating a self-interference signal in a wireless communication signal, and more particularly to a method and apparatus for estimating a self-interference signal based on iterative estimation in which a self-interference signal is effectively estimated using third-order nonlinear distortion that is generated due to a channel and the use of a high-power amplifier.2. Description of the Related Art[0003]As shown in FIG. 1, when a base station 100 communicates with terminals 110 and 120 using an uplink and a downlink, a general communication system allocates different channels, acquired by dividing a frequency band, or different time slots to the uplink...

AI Technical Summary

Benefits of technology

[0007]An object of the present invention is to provide a method for effectively estimating and eliminating a self-interference signal in a full-duplex environment.

[0008]Another object of the present invention is to provide a method for effectively estimating a distortion factor that distorts a self-interference signal.

[0016]Also, an apparatus for estimating a self-interference signal according to an embodiment of the present invention includes a processor for estimating third-order nonlinear distortion, which distorts a self-interference signal, based on transmission signals and reception signals for two preamble signals that are transmitted from a transmission antenna of one terminal to a reception antenna thereof, updating the reception signal by eliminating the third-order nonlinear distortion therefrom, re-estimating the third-order nonlinear distortion based on the updated reception signal, and estimating the self-interference signal based on final third-order nonlinear distortion, which is repeatedly re-estimated as many times as a preset number of iterations; and memory for storing the transmission signals, the reception signals, and at least one of the intermediate third-order nonlinear distortion and the final third-order nonlinear distortion.

[0019]Here, the processor may calculate an updated reception signal by eliminating the third-order nonlinear distortion from a first reception signal for a first preamble signal, among the two preamble signals, and may re-estimate the channel coefficient and the nonlinear distortion gain using the updated reception signal and a first transmission signal for the first preamble signal.

Problems solved by technology

However, when signals are simultaneously transmitted and received, a signal transmitted from a transceiver may act as interference on a received signal.

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